package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @Auther: zh
 * @Date: 2025/5/29 - 05 - 29 - 19:33
 * @Description: com.sky.service.impl
 * @version: 2.1
 */
@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     *新增菜品对应的口味
     * @param dishDTO
     */
    @Transactional  //开启事务，保持一致性
    //因为涉及到多个表，所以添加@Transactional的注解（需要在启动类上添加@EnableTransactionManagement注解）：
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入1条数据
        dishMapper.insert(dish);

        //TODO 插入菜品及其对应的口味集合
        //向口味表插入n条数据
        //获取insert语句生成的主键值
        Long dishId = dish.getId();
        //可以获取到是因为设置了<insert id="insert" useGeneratedKeys="true" keyProperty="id">

        List<DishFlavor> flavors = dishDTO.getFlavors();
        //前端提交的口味不为空
        if(flavors != null && flavors.size()>0){
            //向口味表插入n条数据
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult PageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.page(dishPageQueryDTO);
        long total = page.getTotal();
        List<DishVO> records = page.getResult();
        return new PageResult(total,records);
    }

    /**
     * 批量删除菜品
     * TODO 批量删除菜品（不能删除：存在起售中的菜品，不能删除：菜品被套餐关联）其实也就是添加了两个查询sql。
     */
    @Transactional
    public void deleteBatch(List<Long> ids){
        //不能删除：存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus()== StatusConstant.ENABLE){ //状态为1起售中
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //不能删除：菜品被套餐关联，一个菜品被多个套餐关联！！！
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size()>0){
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
      /* //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/

        //批量删除
        //删除菜品表中的菜品数据
        dishMapper.deleteByIds(ids);
        //删除口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return  dishVO;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        List<Dish> list = dishMapper.list(dish);
        return list;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        //更新菜品数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);

        //更新口味数据
        //删除口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        //TODO 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        //前端提交的口味不为空
        if(flavors != null && flavors.size()>0){
            //向口味表插入n条数据
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 启售禁售菜品
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        //TODO 为什么上面这样做也能做到仅仅修改状态？？学习一下builder？
        //Dish dish = dishMapper.getById(id);
        //dish.setStatus(status);

        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlovor(Dish dish) {

        //1、根据菜品分类id查询:菜品
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();
        //我的代码
        //2、根据dishId查询:口味集合
        dishList.forEach(dish1 -> {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(dish1,dishVO);
            //根据dishId查询口味集合并存入dishVO
            List<DishFlavor> Flavors = dishFlavorMapper.getByDishId(dish1.getId());
            dishVO.setFlavors(Flavors);
            dishVOList.add(dishVO);
        });

        //老师代码
   /*     for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }*/


        return dishVOList;
    }
}
